Isotope Effect and Phonon Softening in Superconducting Borocarbides and Boronitrides

Tuğrul HAKİOĞLU

Makale detayları

Isotope Effect and Phonon Softening in Superconducting Borocarbides and Boronitrides

Yazarlar:

Tuğrul HAKİOĞLU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 1998 Vol.22 Issue 9, pp.863-872

Belge Tipi:

Makale

Yayın Tarihi:

8/1998

Belge Dili:

Türkçe

Document ID (Org No.):

2000763267

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

The isotope effect in the recently disvovered class o  superconductors LuNi2B2C and La3Ni2B2N3 is investigated in the  context of electron-squezed phonon interaction renormalizing the Ni-d  electron-electron correlations.  Squeezed phonon mode originates from  the anharmonic character of the tetragonal Ni-B structure and is  polarized in the vortical direction to the Ni layers.  The isotope  effect arises as a result of the zero point motion of the Ni-Ni  d-electron hopping amplitude dominantly due to this vertical phonon  mode.  Within this model the isotope exponent is calculated to be  aB \leq 0.20 as compared to the recently found experimental  value aBexp = 0.27 \mp 0.10.  Finally, the phonon frequency  softening predicted by our model eletron-phonon interaction is  discussed within the context of recent experiments on the relevant  boron A1g softening.

 

The isotope effect in the recently disvovered class o  superconductors LuNi2B2C and La3Ni2B2N3 is investigated in the  context of electron-squezed phonon interaction renormalizing the Ni-d  electron-electron correlations.  Squeezed phonon mode originates from  the anharmonic character of the tetragonal Ni-B structure and is  polarized in the vortical direction to the Ni layers.  The isotope  effect arises as a result of the zero point motion of the Ni-Ni  d-electron hopping amplitude dominantly due to this vertical phonon  mode.  Within this model the isotope exponent is calculated to be  aB \leq 0.20 as compared to the recently found experimental  value aBexp = 0.27 \mp 0.10.  Finally, the phonon frequency  softening predicted by our model eletron-phonon interaction is  discussed within the context of recent experiments on the relevant  boron A1g softening.

Makale detayları

Isotope Effect and Phonon Softening in Superconducting Borocarbides and Boronitrides

Yazarlar:

Tuğrul HAKİOĞLU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 1998 Vol.22 Issue 9, pp.863-872

Belge Tipi:

Makale

Yayın Tarihi:

8/1998

Belge Dili:

Türkçe

Document ID (Org No.):

2000763267

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Turk. J. Phys.

22

(1998)

863-872. Full text: pdf Other articles published in the same issue: Turk. J. Phys.

vol.22

iss.9.

Sayı

Makale detayları

Isotope Effect and Phonon Softening in Superconducting Borocarbides and Boronitrides

Yazarlar: Tuğrul HAKİOĞLU

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 1998 Vol.22 Issue 9, pp.863-872

Belge Tipi: Makale

Yayın Tarihi: 8/1998

Belge Dili: Türkçe

Document ID (Org No.): 2000763267

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Turk. J. Phys.

22

(1998)

863-872. Full text: pdf Other articles published in the same issue: Turk. J. Phys.

vol.22

iss.9.

Sayı

Yazarlar:

Tuğrul HAKİOĞLU

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 1998 Vol.22 Issue 9, pp.863-872

Belge Tipi:

Makale

Yayın Tarihi:

8/1998

Belge Dili:

Türkçe

Document ID (Org No.):

2000763267

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101